Now I'll go ahead and answer my own question and say I'm pretty damn certain the only reason why Sony is doing this "remaster" is because season 2 of the HBO series is coming soon and they want to capitalize on it. I'm certain that's the main reason why we got the PS5 version of TloU1 and I'm sure that's exactly why the second game is getting a similar treatment.
With TLoU1 I will grant there was a surprising amount of graphical enhancements made that I can see at least some form of justification to remaster that game for PS5 despite the PS4 version of the game already including enhancements like 60 FPS, but with the second game when I watched comparison videos between the PS4 version running on PS5 and this new native version the amount of enhancements looks extremely minimal at best. It sounds like the only significant new content in this PS5 edition is they're adding a new roguelike game mode, which sounds neat, but it sounds like that's it.
At the very least it is worth noting that if you already own the PS4 version you can upgrade to the native PS5 edition for only $10, rather than having to pay a full $70 for the first game even if you already owned the PS4 edition.